Abstract
An organic solvent free and efficient heterogeneous synthesis for bridging heteroaryl halides and 4-fluorophenylboronic acid was studied in aqueous media according to the Suzuki cross-coupling protocol. High yields of heteroaryl-aryl fluorides were successfully obtained with: chloro-/bromo-substituted pyridine, thiophene, indole, and inzole in neat water using palladium phosphinous acid complexes (POPd)/tetrabutylammonium bromide (TBAB) as co-catalysts. A possible mechanism for the heterogeneous coupling reaction is proposed and discussed according to the function of the TBAB interphases. The notable properties of the reported method are highly co-catalytic activity, hetero-atom tolerance, simple separating procedure and little environmental disposal impact.
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Acknowledgments
We are grateful for financial support from the Program for Liaoning Excellent Talents in University (No.LR2014009), (No.L2015258) and the kind donation of Pd-catalysts from Combiphos Catalysts.
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Li, B., Zhang, Z. POPd/TBAB co-catalyzed Suzuki cross-coupling reaction of heteroaryl chlorides/bromides with 4-fluorophenylboronic acid in water. J IRAN CHEM SOC 13, 637–644 (2016). https://doi.org/10.1007/s13738-015-0775-9
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DOI: https://doi.org/10.1007/s13738-015-0775-9